[PATCH] D56325: Sort symbols in .bss by size.

[Rui Ueyama via Phabricator via llvm-commits]

ruiu added a comment.

George,

0.5% is not a micro-optimization if it works for many applications. If you find a heuristic that can generally reduce memory usage by 0.5%, that's not negligible. Imagine for example 0.5% memory usage reduction in a huge cloud application. You might be able to save multi million dollars.

Vic,

That said, the numbers you've shown so far don't honestly seem very convincing. The number of data points is too few that I can't see if it generally works. I believe I can test your patch myself and see how it works for Linux applications by parsing /proc/self/smaps (which contains information about the number of dirty pages). Let me try to do that for a few applications like clang.


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